Molding machine



H. L. DEMMLER Nov. 3

MOLDING MACHINE Fi'led Aug. '7, 1920*` 3 Sheets-Sheet 2 mn u Arroynmsv www Sheets-Shed 3 H. @EMMMMR MGLDING MACHINE Filed Aug. 7, 1-920 Nov. 3i @925.

WITNESSS Patented Nov. 3, 1925.

UNITED STATES j y 1,560,145v PATENT OFFICE.'

HENRY L. DEMMLER, F KEWANEE, ILLINOIS.

MOLDING MACHINE.

Application filed August 7, 1920. Serial No. 401,924.

To all whom it may conce/m.'

Be it known that I, HENRY L. DEMMLER, a citizen of the United States, residing at Kewanee, in the county of Henry and State of Illinois, have invented a new and useful Molding Machine, of which the following is a specification.

This invention has reference to molding machines and one of its objects is to provide a structure capable of supporting a iiask or molding box with a pattern in position for molding and the flask filled with sand, whereby the` sand may be solidified about the pattern by jolting or jarring.

Another object is to provide a fluid pressure actuated molding machine having improved mechanism for controlling the distribution of the pressure medium. Other objects will appear in this specification taken in connection with the accompanying drawings. v j

`The invention preferably comprises a vertical cast body member provided with a reduced cylindrical upper end and a cylindrical sleeve or cylinder, the upper end of which is closed, adapted to reciprocate on the stationary pistomthe sleeve being longer than the reduced piston and adapted to strike `against a shoulder yor anvil yat the bottom of its stroke to produce a jarring action. Valves and fluid passages are arranged in the piston, and a power-operated valve actuating mechanism` is associated with the valves to control the admission and exhaust ofa fluid pressure medium to and from the expansion chamber. Thetop of the cylinder forms a platen toy support flasks carrying a pattern and filled with loose sand. On each down stroke of the cylinder, the jarring action due to sudden stoppage of the sleeve against the anvil will be imparted to the flask, thus compacting thesand about `the pattern, and the operation of tamping or ramming by hand is dispensed with.

The invention will bel best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming part Vof this specification, with the understanding, however, thaty the invention is' not confined to any strict conformity with the showing in the drawings, but may be changed and modified so` long as such `changes and modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

j Fig. 1 is a side elevation of the molding machine of the jolting or jarring type.

Fig. 2 is a side elevation of the opposite side of the machine from that shown in Fig. 1 and omitting the driving mechanism.

Fig. 3 is a vertical section on the line 3 3 of Fig. 2.

Fig. 4 is a Fig. 3.

Referring to the drawings there is shown a body structure comprising a base plate 1 with uprising supports 2 on opposite sides carrying at the upper ends a block constituting a stationary piston 3 having a shoulder 1l at its lower end joining an anvil. Fitted to the piston 3 so as to move snugly yet freely up and down thereon is a sleeve or cylinder 4 provided with a head 5 and acentral stem or rod 6. The head 5 is or may be plane or llat to receive a mold board 7 to sustain aflask or mold box 8 designed to hold a pattern 9 to be embedded in molding` sand 10. The sleeve 4 where entered by the piston is of sufcient'length to permit the sides of the sleeve to contact with a shoulder or anvil 11, while the head 5 is section on the lineV 4-4 .of

sufliciently spaced from the top of the piston to provide a chamber 12. The piston has packing rings 13 carried thereby and engaging the inner walls of the sleeve, and the stem 6 has packing rings 14 engaging the walls of a bore 15 through which the stem 6 extends and projectsV beyond the bottom of the block or piston 3. Extending through the block or piston 3 to one side of the rod 6 is an upright passage 15a formed at the upper end into a valve seat 16 and at the lower end closed by a bushing 17 carrying a stulling box or packing gland 18. Extending through the passage 15LL is a valve rod 19 carrying at its upper end a valve head 2() adapted to the seat 16 and at the lower end extending through the stalling box 18 and terminating in a threaded extension 21 to which nuts 22 are applied. The threaded portion 21 of the rod 19 extends through one Iend of a lever 23 with the nuts on opposite sides and there serving as stops. When the lever 23 is raised the valve is opened and when the lever 23 is lowered the valve is closed.

`Leading into the passage 15a is a branch passage 24 which may receive fluid under pressure, say compressed air, by Way of a pipe 254 conveniently tapped Ainto the piston 3 at an appropriate point.

Extending through the piston 3 on the side of the rod 6 remote from the passage l5 is another passage 26 extending in an upright direction from a bra-nch passage 27 extending from one side ot the piston 3 to the lower end of the passage 2G.` At the upper end, the passage 26 is provided with a valve seat 27a for a valve head 28 carried by a valve stem 29 extending downwardly through the bottom ot' the piston below the passage 26 and at its lower end formed With a shoulder 30 and a reduced continuation 31. At the lou'erend, below the piston 3, the rod G vhas secured thereto a guide bar 32 through Which `the reduced end 3l of the valve rod 29 slidably passes. The 'lower end of the reduced portion 31 of the valve rod 2.9 is engaged by a lever 83.

Carried by the base plate' l between the supports 2 is a housing 34 having alined journal bearings 8,5, 36, 37 for a shaft 38 extending beyond the end of the housing und there. provided with a pulley 39 which may be taken as indicative of any means for applying power to the shaft, whether by Way of a belt or by direct connection With an electric motor. On the shaft is a Worm 40 meshing with a Worin gear 4i on a transverse shaft 42 suitably j ournaled in the housing and extending to the exterior thereof Where the shaft 42 carries cams 43 and 44, each engaging' a roller 45 on a respective lever 23 andBS, the cams under-riding the rollers. Any suitable Vmeans may be employed to drive the shaft 38, as for instance, a motor 57, preferably of the electric type, mounted on a; pedestal 54, as shown in Figure l, and connected by a belt 52 to the pulley 3 In using the invention a flask 8 With a pattern 9 and sand l0 thereinis placed on the board 7 and the latter is placed on the platen nr cylinder head 5, the vlatter being at its lowermost position yvith the inlet valve 20 closed and held closed by spring 45 connected at one end to the lever 23 and at the other end to a fixed part of the structure. Non', a suitablelluid under pressure, such as compressed air, is admittedfthrough the pipe 25 and the passages 24 and l5, the motor 5l is started, 'and the valves are operated to admit and exhaust air to and from the expansion" chamberl2, the inlet valve 20, for example, being opened While ythe exhaust valve is closed. Quickly thereafter the rotation of the shaft ld'reverses the position o1" the cams 43 and 44 so that the valve 20 is closed by gravity and the tension spring 46 and the valve 28 is opened, allowing lthe escape o1"- compressed air from Y'the chamber ,l2 through the passages 2 6 and 27 to the atmosphere. rlhe cylinder 4 quickly responds allowing the platen with the loaded flask "8 'thereon'to' fall Kuntil the sleeve strikes the shoulder ll and the sleeve/andy parts carried thereby are suddenly stopped. This produces ,a .pronounced jar to the ask and the sand 'therein compacting the latter about the pattern. The reciprocations of the piston 'follow each other in rapid succession so that the sand becomes compact and firm as though it had been tainped, egrceot that the compact-ing effect islinateriarlly better than ivhen Yondinary tamping isl folleWed.`

lt iS material 'i0 ,the proper| action .Q .f the driving'mechanism that there should be a full and sharp exhaust, lwhich is brought about by providinga relativelylarge'exhaast peri 28a .@.Oliltelsimk "inthe passage 2G. Also the passages `26 and 2f? are made 1ers@ "whereby [1101'naterial rsistance ifs offered to the exhaust. The c ains 43 and 44 each have opposite concentric portions 47,

48 with Podien 47 fters/eter 'dus than the portion-48 and these' two concentric portions are joined'by chord .portifdns 49, 5,0 in parallel relation.,A Considering tl1 e"c0n`cen tric or curved portion 47 as lo'f greater radius than the portion 48,"the` lever 23 or 33, as the case may be, Will be raised to its grkve'atest extent and .the valve controlled thereby vvlill then'be open. lVhen the roller 45 isriding upon the curved portion 48 the valve oon'- trolled thereby `Will be' closed.`r The chord portions 49 and 5.0 'permita sudden "dropA of the respective leverory al s'uddenrise thereof, so that the action of'ope'n'ing 'or' closing vthe valves is" quick. The-V adjustmentv provided by the nuts 22 permits "a ,reg'fulated compressed air'supplyftothe chamber l2 and the form'of thecam 45 engaging Vthelever 33 provides for the' quick .andzfr'ee exhans'tf By providingthe'ivalveistem .29 with a redl'uced end 31' to Vforin lthe shoulder BOH'the latter will be engaged the Vbar`32 and open the exhaust valve 'should it happen that theI air is on when the'l motor "is 4not running.Y l l A lVhat'is claimed is:

l. ln a molding '1na,chine,rthe .combination of av body lemberhaving ports v'v'ith valve seats, 'valvesf'r said ports, a sleeve slidably engaging the bodymember and raisedby fluid pressure introduced through one of said portsan anvil 'for arresting the sleeve in 'its descent', levers for operating said valves and having"rollers thereon, and means driven' "independently of the sleeve 'andi coactingfwith vthe rollers for operatingthelevers. 'l i' 2. In a. 'molding machine, the combination of afbody member having ports lWith valve seats, valves'forsaid ports, 'asleeve slidingly engaging the body member, levers for engaging thefvalvesl and thei'eon,"cains lfor engaging the' rollers on the levers, .Worin gearing 'for driving: the

having rollers c) al.

cams and a motor for driving the Worm gearing.

3. In a molding machine, a reciprocable member mounted to move in an upright path and having a head for carrying a charged molding flask, valves for admit-- ting compressed fluid to and exhausting it from the reciprocable member, and means for operating the valves comprising a rockable lever for each valve, a roller carried by each lever, a cam for each roller with the cam having oppositely disposed concentric surfaces of different radii and chord surfaces joining the ends of the concentric surfaces, and means for driving the cams.

4. In a molding machine of the jolting or jarring type, a reciprocable member, inlet and exhaust valves for the reciprocable member With the exhaust valve provided with a stem extension of reduced diameter, means for operating the valves, a rod carried by the reciprocable member and a bar carried by the rod and traversed by the reduced end of the exhaust valve rod, Whereby When the valve operating motor is not running and air is admitted to the reciprocable member the exhaust valve is held open.

5. In a jarring machine, a stationary piston, a cylinder reciprocable on the piston, a head on the cylinder forming a platen, said piston having two Huid passages therein for the admission and exhaust of an expansible fluid, a valve having a stem projecting through the piston arranged in each passage, independent power operated means for opening and closing said valves, and means associated With the cylinder 'for opening the exhaust valve When the power operated means is idle and the inlet valve is open.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature.

HENRY L. DEMMLER. 

